Answer:
Correct choice is D
Step-by-step explanation:
Given the system of two equations:
![\left\{\begin{array}{l}4x+y=8\\6x-9y=12\end{array}\right..](https://tex.z-dn.net/?f=%5Cleft%5C%7B%5Cbegin%7Barray%7D%7Bl%7D4x%2By%3D8%5C%5C6x-9y%3D12%5Cend%7Barray%7D%5Cright..)
Fro mthe first equation
![y=8-4x.](https://tex.z-dn.net/?f=y%3D8-4x.)
Substitute into the second equation
instead of y:
![6x-9(8-4x)=12.](https://tex.z-dn.net/?f=6x-9%288-4x%29%3D12.)
Note that
then the second equation will take look
![6x-9(-4x+8)=12.](https://tex.z-dn.net/?f=6x-9%28-4x%2B8%29%3D12.)
I am very stuck on this answer simplify 8/12
Answer:
for 18 x is 6 and for 20 it is 11
Step-by-step explanation:
For 18, since -1+2x and 5+x is the same thing, set up and equation. WE can simplify to -1+x=5 and then we get x=6
For 20, 18 is 11 since 18=-4+2x. If we simplify we get 22=2x then we can use algebra to say that x=11
Hope this helps :)
Answer:
100,000+60,000+60
Step-by-step explanation:
![let \: f(x) = ax {}^{2} + bx + c \\ thus \: f(x) \: represents \: a \: parabola \: whose \: axis \: is \: parallel \: to \: the \: y \: axis \: and \: vertex \: is \: \frac{ - b}{2a} ,\frac{ - d}{4a} \\](https://tex.z-dn.net/?f=let%20%5C%3A%20f%28x%29%20%3D%20ax%20%7B%7D%5E%7B2%7D%20%2B%20bx%20%2B%20c%20%5C%5C%20thus%20%5C%3A%20f%28x%29%20%5C%3A%20represents%20%5C%3A%20a%20%5C%3A%20parabola%20%5C%3A%20whose%20%5C%3A%20axis%20%5C%3A%20is%20%5C%3A%20parallel%20%5C%3A%20to%20%5C%3A%20the%20%5C%3A%20y%20%5C%3A%20axis%20%5C%3A%20and%20%5C%3A%20vertex%20%5C%3A%20is%20%5C%3A%20%5Cfrac%7B%20-%20b%7D%7B2a%7D%20%2C%5Cfrac%7B%20-%20d%7D%7B4a%7D%20%5C%5C%20)
At the respective max and min values